Cheyyar is a town in the Tiruvannamalai District near Kanchipuram in the Tamil Nadu state of South India. It gets its name from the Cheyyaru River. The town is situated at 30 km from Kanchipuram, 60 km from Vellore and 105 km from Chennai, well connected by buses on SH 5 and SH 45. The town contains an ancient temple called Vedapureeswarar Temple situated on the banks of the river, and there is a legend that Thirugnana Sambandar, one of the four great saivite saints visited the temple and caused a male palm tree to flower by singing verses in Tamil.
There is another famous ancient temple called Patcheeswarar temple built during the Pallava's rule in the very heart of the town. The town was in the North Arcot District (part of Vellore district) until Tiruvannamalai district was formed. It has a sub collector office and is the third largest town in the district. This town has a Government Arts College, dating from the early 1970s. The chief occupations of the people are agriculture and handlooming.
The temple is devoted to Lord Vedapuresswarar who came here and imparted his spiritual knowledge regarding the Vedas.
RCM church in cheyyar is well known landmark among the localities.This church was renovated in the late 1990s.
Cheyyaru started industrialization following the establishment of the industrial complex by the State Industries Promotion Corporation of Tamil Nadu (SIPCOT). With an allotable field area of 619.35 Acres. Since the investment hot-spots such as Sriperumbudur and Oragadam have become overcrowded, Cheyyaru has become an alternative choice. This is evidenced by the recent announcements of a 250-acre (1.0 sq km) hi-tech Special Economic Zone for automative components, a 300-acre (1.2 sq km) electronics hardware park and the commitment from the Taiwanese Shoe Company to set up its unit. One of the largest sugar mills in the country - Cheyyar co-operative sugars - is situated near the town.
On Nov, 2009 Tamil Nadu cabinet approved the Mahindara & Mahindra's Rs 1800 core automobile project in 450 acres. This unit will produce tractors, SUVs and commercial vehicles and auto parts. Aluminum die cast unit by Ashley Alteams, a joint venture by Ashok Leyland and Finland-based Alteams Oy started its production on Jan, 2010. This High pressure die cast will manufacture automobile and telecommunication components with initial capacity of 7000 ton per year.